Periscope with a transparent hood



Dec. 23, 1924.

J. HUMBRECHT PERISCOPE WITH A TRANSPARENT HOOD Filed Alli. 23. 1921Inventor Patented Dec. 23, 1924.

YUNITED STATES 1,520,245 PATENT CFFICE.

JULES HUMBRECHT. 0F FRIEDENAU, NEAR BERLIN. GERMANY, ASSIGNOR T0 THE"FIRM OF OPTISCHE ANSTALT C. P. GOERZ AKTIENGESELLSCHAFT, 0F FRIEDENAU,

GERMANY.

Application filed August 23, 1921.

PERISCOPE WITH A. TRANSPARENT HOOD.

Serial No. 494,498.

(GRANTED UNDER THE PROVISIGNS 0F lTHE ACT 0F MARCH 3, 1921, 41 STAT. L.,1313.)

To all w/iofm. t may concern:

Be it known that I, JULES HUMBRECi-rr, a citizen of the German Republic,and resident of Friedenau, near Berlin, Germany,

have invented certain new and useful Improvements in and Relating toPeriscopes with Transparent lloods (for which I have filed applicationsfor patent in Germany December 2l, 191.5; Hungary June 4, 1917, andAustria December i3, 191.7), of which the following is a specification.

This invention relates to a periscope particularly for submarinesprovided with a light entrance reflector adapted to rotate about an axissubstantially transverse to the longitudinal main casing of theinstrument so as to allow observation ot' objects under variableelevation such as air-crafts. The invention relates more particularly tosuch instruments of this kind which are provided with a transparent hoodfor closing the instrument easing at the light entrance end and with alens movable with the entrance reflector for compensating the light raydistorting the effect oi. the transparent hood of the instrument.

The invention consists in an improved instrument of the kind referred toallowing convenient observation ot objects ot varying elevation, whereinfor securing this effect a coupling between the rotatableentrancereflector and the correcting lens movable therewith is providedof such kind that the correcting lens is rotated with double the angularvelocity of the entrance reflector. Such kind of coupling between theentrance reflector and the correcting lens yhas the effect that theparts are permanently in operative position with relation to each otherirrespective the elevation under which the observation takes place.

.An embodiment ot' the invention is illustrated on `the annexed drawingand de- `scribed in the following specification with reference to thedrawing.

Fig. .1 shows the instrument in axial section partly in side elevation.

Fig, VL is an axial section through the upper .part of the instrumentshowing the rotatable entrance reflector and the correcting lens in aposition different from that shown in Fig. l.

The transparent hood of the instrument v coupled with at the lightentrance end is designated l. Centrally to this globular hood isarranged the light entrance reflector which in the embodimentillustrated on the drawing consists of two right angled triangularprisms 2, 3 which are cemented together. The contact surface 4 of theprisms has the function of a surface refiecting on both its sides. InJr'ront of the entrance reflector 4 is arranged as already proposed acorrcctii'ig lens 5 which compensates the lens effect of the globularhood 1. rl`he correcting lens 5 is the entrance reflector 4. For thispurpose the reflector 4 is connected with a toothed wheel 6 and thecorrecting lens 5 with a. topthed wheel 7, the said two wheels meshingwith toothed racks 8 and 9 respectively, said toothed racks beingprovided on a common carrier 1() connected to a rod ll which is adaptedto be moved by the observer.

l2 designates the objective system; 13 is a transparent plate arrangedin the image plane of the objective and provided with suitable marks.ylet and l5 designate the two elements oi an image reversing system and1G an angular ocular.

The path of a pencil of rays indicated in the drawings shows that aspecial construction ot' the rotatable reflector with which theinstrument is provided aflords the possibility that even in the zenithposition of the reflector shown in Fig. 2 light rays are reflected tromthe double sided reflector 4 so as to impinge on the objective 12 and toform an image of the object in zenith position viewed at by theinstrument.

What I claim is:

l. In a periscope with a transparent hood closing thc light entrance endVof the instrument in combination an entrance reflector and a lens infront oi' the entrance refiector adapted to compensate the lens el'ectof the hood both rotatable about a common axis substantially at rightangles to the axis ot' the periscope, gearing adapted tosinniltaneousl)Y rotate said lens and said entrancereflector the angularvelocity communicated by said gearing to said lens being double thevelocity communicated to said entrance reflector.

2. In a periscope with a transparent hood closing the light entrance endof the instrument. in combination au entrance reflector and a lens infront of the. entrance relector adapted to compensate. the lens effectof the hood both rotatable about a common axis substantially at rightangles to the axis of the periscope, gearing adapted to simultaneouslyTrotate said lens and said entrance reiector the latter being formed of acompound prism having two symmetric halves with one adjacent. reflectorsurface forming-adouble sided operative entrance reflector for theinstrument said compound prism having an angular velocity communicatedto it by said gearingr halt that of said lens. a

3. In a periscope with a transparent hood closing the light entrance endof the instrument in combination a compound prism of square crosssection consisting. of two right angled triangular. prisms withcementedv specification in the prese-nce of two subscribing witnesses.

f Witnesses: a

e HERMANN REISING,

JOHANN-Rowena; l

JULES runvnssaucrrrgf, e

